| 초록 |
This work reports that surface-modified biosorbents are able to bind anionic precious metals from industrial wastewaters. The surface of Corynebacterium glutamicum biomass was modified using polymer coating and chemical treatment. In order to introduce a large number of amine groups, the raw biomass was coated with polyethylenimine (PEIB) to enhance the Ru sorption capacity. Then, the PEIB was chemically modified to remove the carboxyl groups. The resulted biosorbent was designated as decarboxylated-PEIB (DC-PEIB). The Ru sorption isotherm experiments were carried out to evaluate the sorption capacity of biosorbents and commercial sorbent (PEI on silica). As a result, the maximum sorption capacities of the DC-PEIB, PEIB and RB were 47.13 mg/g, 34.37 mg/g and 24.96 mg/g respectively. Moreover, the maximum Ru uptake of DC-PEIB was 4.12 times higher than that of the PEI on silica. |
